package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid( phone)) {
            // 2.手机号格式错误
            return Result.fail("手机号格式错误");
        }
        //3.生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set("login:code:"+phone, code,1, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功，验证码：{}", code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid( phone)) {
            // 手机号格式错误
            return Result.fail("手机号格式错误");
        }

        // 校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        //不一致，报错
        if (cacheCode == null || !cacheCode.equals(code)) {
            //验证码错误
            return Result.fail("验证码错误");
        }
        //一致
        //根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //判断用户是否存在
        if (user == null) {
            //不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
//        生成token
        String token = UUID.randomUUID().toString();
        //保存用户
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO);
        //存入redis
        String tokenKey ="login:token:"+ token;
        stringRedisTemplate.opsForHash().putAll( tokenKey , userMap);
        stringRedisTemplate.expire(tokenKey, 30, TimeUnit.SECONDS);
        return Result.ok(token);

    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
       String userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:" + userId + keySuffix;
        //4.今天是
        int dayOfMonth = now.getDayOfMonth() - 1;
        //5.写入redis
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //本月签到记录
        //1.获取当前登录用户
        String userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:" + userId + keySuffix;
        //4.今天是
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字 BITFIELD sign:5:202203 FLAG GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        //6.循环遍历
        int count = 0;
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null){
            return Result.ok(0);
        }
        while (true){
            if((num & 1) == 0){
                break;
            }else {
                count++;
            }

            num = num >> 1;
        }

        return Result.ok(count);

    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName("user_" + RandomUtil.randomString(10));
        //保存用户
        save(user);
        return user;
    }
}
